Abstract
Human red cell cytosol acid phosphatase activity is supported by a main enzyme which can be extracted by DEAE and phosphocellulose chromatography. It uses pNPP as a substrate and is a protein phosphatase specific to phosphotyrosine. It dephosphorylates the tyrosine-phosphorylated cytosolic fragment of membrane protein 3. When taken together, these results suggest that the physiological role of red cell acid phosphatase is the FB3 phosphotyrosine dephosphorylation. Whatever it may be phosphotyrosine protein phosphatase activity is the first role of red cell acid phosphatase to be demonstrated.
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